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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Molecular mechanisms of cell polarity and morphogenesis in moss Physcomitrella patens
 D'Agostino, Viktoria ; Žárský, Viktor (advisor) ; Soukup, Aleš (referee)
Plant cells are able to establish polarity and expand by tip growth. Polarized cells often embrace functions important for plant viability. The process of tip growth requires actin cytoskeleton in collaboration with a number of accessory proteins. The position of the intensively expanding region is provided by microtubules and the function of signalling proteins. Polarized secretion regulates the structural properties and subsequently the shape of the cell wall. Some components of the secretory and signalling pathways are highly conserved among eukaryotes, others are found exclusively in the plant kingdom. Though much has been discovered in yeast and animal cells, many mechanisms in plants are yet to be revealed. Model systems performing tip growth, such as root hairs, pollen tubes and protonema cells, enable comparison and thus a complementary overview of the various processes.
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Interplay of cytoskeleton and secretory pathway during exocytosis in plant cells
 Aldorfová, Klára ; Sekereš, Juraj (advisor) ; Vosolsobě, Stanislav (referee)
Cytoskeleton is known to participate in exocytosis of yeast and animal cells. The role of plant cytoskeleton during exocytosis has not been fully understood yet. However, both actin and microtubules evidently contributes to the secretion of specific cargo proteins or cell wall components. Plant cytoskeleton influences the dynamics of exocytosis through various functions. First, secretory vesicles are delivered near the plasma membrane. Second, microtubules were shown to mark the place of exocytosis. Third, cytoskeleton is able to prevent membrane fusion by simple separation of compartments. Fourth, cytoskeleton potentially mediates the interaction between molecules of secretory apparatus. Secretion of certain cargo molecules appears to be dependent on different cytoskeleton types and the exocytosis seems to be specifically regulated in each tissue. This thesis aims to describe interplay of cytoskeleton and secretory pathway on the example of tip growth and to predict future direction of research on secretory pathway based on cellulose synthase secretory data.
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